|Instructions for the Autonetics Cost Reduction Slide Rule - Autonetics. A Divison of North American Aviation, Inc., Downey, California|
Instruction sheet that came with the Autonetics Cost Reduction Slide Rule
Keywords: slide rule; instruction manual; Autonetics; cost reduction
|The effects of shock wave compaction on the transition temperatures of A15 structure superconductors - Otto, G. H|
Several superconductors with the A15 structure exhibit a positive pressure coefficient, indicating that their transition temperatures increase with applied pressure. Powders of the composition Nb3Al, Nb3Ge, Nb3(Al0.75Ge0.25), and V3Si were compacted by explosive shock waves. The superconducting properties of these materials were measured before and after compaction and it was found that regardless of the sign of the pressure coefficient, the transition temperature is always lowered...
Keywords: CAPACITANCE; CRYOGENICS; PROPELLANTS; SPACE SHUTTLES; COST REDUCTION; PERFORMANCE TESTS; SENSORS
|Correlative Analysis of hard and Soft X-rays in Solar Flares using CGRO/BATSE and YOHKOH - Zarro, Dominic M|
The objective of this work is to study different mechanisms of solar flare heating by comparing their predictions with simultaneous hard and soft X-ray observations. The datasets used in this work consist of hard X-ray observations from the Bragg Crystal Spectrometer (BCS) and Soft X-ray telescope (SXT) on the Japanese Yohkoh spacecraft.
Keywords: STIRLING ENGINES; STIRLING CYCLE; COST REDUCTION; TRANSPORTATION; INDUSTRIES; UNITED STATES
|The Frequency Detuning Correction and the Asymmetry of Line Shapes: The Far Wings of H2O-H2O - Ma, Q.|
A far-wing line shape theory which satisfies the detailed balance principle is applied to the H2O-H2O system. Within this formalism, two line shapes are introduced, corresponding to band-averages over the positive and negative resonance lines, respectively. Using the coordinate representation, the two line shapes can be obtained by evaluating 11-dimensional integrations whose integrands are a product of two factors...
Keywords: ARCHITECTURE (COMPUTERS); TORUSES; RESILIENCE; BANDWIDTH; SWITCHES; COSTS; COMMODITIES; COST REDUCTION
|Exploring the Hot Galactic Halo Using Shadows of High Latitude Clouds - Juda, M|
The objective of this proposal was to measure variations in the 1/4 keV emission from the galactic halo, using ROSAT (x-ray astronomy satellite) Position Sensitive Proportional Counters (PSPC) observations toward known enhancements in the absorbing column density along the line-of-sight out of the Galaxy. Target directions were selected to have a low total hydrogen column density but to also show significant gradients in the amount of absorbing material, as traced by Infrared Astronomical Satell...
Keywords: EXPERT SYSTEMS; OPTIMIZATION; PRODUCT DEVELOPMENT; PROCEDURES; COST REDUCTION; ARCHITECTURE (COMPUTERS)
|The Development of a New Lateral-Control Arrangement - Baker, Paul S|
Development work on an arrangement using ailerons and spoilers for lateral control was carried out by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation on a small commercial airplane in flight and on an airfoil in a wind tunnel. Spoiler hinge moments were reduced by aerodynamic balance. The arrangement was then built into an experimental airplane and further improvements were adopted as the result of flight and tunnel tests...
Keywords: PRODUCTIVITY; NASA PROGRAMS; CONFERENCES; COST REDUCTION; PRODUCT DEVELOPMENT
|Direct Drive Hall Thruster System Development - Hoskins, W. Andrew|
The sta:us of development of a Direct Drive Ha Thruster System is presented. 13 the first part. a s:udy of the impacts to spacecraft systems and mass benefits of a direct-drive architecture is reviewed. The study initially examines four cases of SPT-100 and BPT-4000 Hall thrusters used for north-south station keeping on an EXPRESS-like geosynchronous spacecraft and for primary propulsion for a Deep Space- 1 based science spacecraft...
Keywords: SPACE MISSIONS; REQUIREMENTS; SCHEDULING; ASTRONAUTS; COST REDUCTION; SCHEDULES; HYPOTHESES; ROBOTS
|Final Report, 19 September 1988 - 18 September 1989 - Paciesas, William S|
Support was extended to the Burst and Transient Source Experiment (BATSE) which detects sources by looking for time variability, either intrinsic to a source (such as gamma ray bursts or pulsars) or induced by earth occultation. The support was in the form of testing, calibration, and data analysis software developments. The BATSE Spectral Analysis Software (BSAS) was successfully developed. An effort was led to develop matrices suitable for use with the BSAS spectral deconvolution algorithms.
Keywords: COST ANALYSIS; REDUNDANCY; RELIABILITY ANALYSIS; SYSTEMS ENGINEERING; COST REDUCTION; OPTIMIZATION
|Coupled Aerodynamic and Structural Sensitivity Analysis of a High-Speed Civil Transport - Mason, B. H.|
An objective of the High Performance Computing and Communication Program at the NASA Langley Research Center is to demonstrate multidisciplinary shape and sizing optimization of a complete aerospace vehicle configuration by using high-fidelity, finite-element structural analysis and computational fluid dynamics aerodynamic analysis. In a previous study, a multi-disciplinary analysis system for a high-speed civil transport was formulated to integrate a set of existing discipline analysis codes, s...
Keywords: CONFERENCES; PHOTOMETRY; TELESCOPES; EXPLORATION; EXTRASOLAR PLANETS; MATHEMATICAL MODELS; PLANETARY STRUCTURE; VELOCITY MEASUREMENT; APERTURES; ASTRONOMY; COST REDUCTION
|On issues concerning flow separation and vortical flows in 3 dimensions - Peake, D. J.|
This review provides an illustrated introduction laying the knowledge base for vortical flows about three dimensional configurations that are of typical interest to aerodynamicists and researchers in fluid mechanics. The paper then compiles a list of ten issues, again in illustrative format, that the authors deem important to the understanding of complex vortical flows. These issues and our responses to them provide, it is hoped, a skeletal framework on which to hang the ensuing conference proce...
Keywords: COMPOSITE MATERIALS; LAMINATES; TURBINE BLADES; WIND TURBINES; WOOD; COST REDUCTION; DESIGN ANALYSIS; FABRICATION; STRUCTURAL DESIGN
|Sensitivity Equation Derivation for Transient Heat Transfer Problems - Hou, Gene|
The focus of the paper is on the derivation of sensitivity equations for transient heat transfer problems modeled by different discretization processes. Two examples will be used in this study to facilitate the discussion. The first example is a coupled, transient heat transfer problem that simulates the press molding process in fabrication of composite laminates. These state equations are discretized into standard h-version finite elements and solved by a multiple step, predictor-corrector sche...
Keywords: COST ANALYSIS; COST REDUCTION; DESIGN TO COST; QUALITY CONTROL; CONCURRENT ENGINEERING; OPTIMIZATION; TOTAL QUALITY MANAGEMENT
|Laboratory studies in ultraviolet solar physics - Parkinson, W. H.|
The research activity comprised the measurement of basic atomic processes and parameters which relate directly to the interpretation of solar ultraviolet observations and to the development of comprehensive models of the component structures of the solar atmosphere. The research was specifically directed towards providing the relevant atomic data needed to perform and to improve solar diagnostic techniques which probe active and quiet portions of the solar chromosphere, the transition zone, the ...
Keywords: CIRCUITS; SIMPLIFICATION; CRYPTOGRAPHY; DECODERS; RANGE SAFETY; RECEIVERS; RELIABILITY; SPACE SHUTTLES; COST REDUCTION; FAILURE ANALYSIS
|On-Orbit Calibration of Satellite Gyroscopes - Hashmall, Joseph A.|
In order to maneuver satellites accurately from one attitude to another, onboard rate sensing gyroscopes usually must be calibrated after launch. Several algorithms have been used to determine gyro biases, misalignments, and scale factors. This paper describes algorithms that have been used in the past, discusses their advantages and limitations, and describes a new algorithm and the gyro calibration results obtained using this new algorithm...
Keywords: TELESCOPES; STABILITY; COST REDUCTION; COSTS; DEPLOYMENT; REAL TIME OPERATION; RISK; CONFERENCES; TEMPERATURE EFFECTS; TELEMETRY
|Mathematical Analysis of Space Radiator Segmenting for Increased Reliability and Reduced Mass - Juhasz, Albert J|
Spacecraft for long duration deep space missions will need to be designed to survive micrometeoroid bombardment of their surfaces some of which may actually be punctured. To avoid loss of the entire mission the damage due to such punctures must be limited to small, localized areas. This is especially true for power system radiators, which necessarily feature large surface areas to reject heat at relatively low temperature to the space environment by thermal radiation...
Keywords: ALGORITHMS; SIMULATION; STAR TRACKERS; SUN; ATTITUDE (INCLINATION); ESTIMATES; QUATERNIONS; VECTOR ANALYSIS; COST REDUCTION; CRITERIA; GEOMAGNETISM; OPTIMIZATION
|COMPARATIVE STUDY OF THE HEAT TRANSFER OF A NOZZLE BLADE PROFILE IN A WIND TUNNEL AND IN AN AIR TURBINE - DYBAN, Y. P.|
AN INVESTIGATION WAS MADE OF THE LOCAL AND MEAN HEAT REMOVAL FROM A TEXTOLITE NOZZLE BLADE IN A WIND TUNNEL WITH A THERMAL COUNTER-CURRENT, AND IN THE SECOND CASCADE OF AN AIR TURBINE. PERMALLOY STRIPS WITH WIRES GLUED ON THE NOZZLE BLADE WERE HEATED BY A DC CURRENT DURING THE TESTS. THE FLOW TURBULENCE LEVEL WAS MARKEDLY HIGHER BEHIND THE ROTOR OF AN AIR TURBINE THAN IN A TYPICAL WIND TUNNEL. THE MEAN HEAT REMOVAL COEFFICIENT INCREASED WITH INCREASING REYNOLDS NUMBER...
Keywords: FLIGHT SAFETY; PAYLOADS; SPACE SHUTTLES; SPACECRAFT DESIGN; SPACECREWS; COST REDUCTION; PROJECT MANAGEMENT; SYSTEMS ENGINEERING
|Robot Manipulators - NON|
Space Shuttle's Remote Manipulator System (Canadarm) is a 50 foot robot arm used to deploy, retrieve or repair satellites in orbit. Initial spinoff version is designed to remove, inspect and replace large components of Ontario Hydro's CANDU nuclear reactors, which supply 50 percent of Ontario Hydro's total power reduction. CANDU robot is the first of SPAR's Remote Manipulator Systems intended for remote materials handling operations in nuclear servicing, chemical processing, smelting and manufac...
Keywords: REAL TIME OPERATION; SPACECRAFT ENVIRONMENTS; DISPLAY DEVICES; COST REDUCTION; STREAMS; SAFETY; HEALTH; FLIGHT OPERATIONS
|High energy collimating fine grids for HESP program - Eberhard, Carol D.|
There is a need to develop fine pitch x-ray collimator grids as an enabling technology for planned future missions. The grids consist of an array of thin parallel strips of x-ray absorbing material, such as tungsten, with pitches ranging from 34 microns to 2.036 millimeters. The grids are the key components of a new class of spaceborne instruments known as 'x-ray modulation collimators.' These instruments are the first to produce images of celestial sources in the hard x-ray and gamma-ray spectr...
Keywords: BUDGETING; COST REDUCTION; COSTS; MISSION PLANNING; ECONOMIC FACTORS; MANAGEMENT PLANNING; POSTMISSION ANALYSIS (SPACECRAFT)
|Postural Control Disturbances Produced By Exposure to HMD and Dome Vr Systems - Harm, D. L.|
Two critical and unresolved human factors issues in VR systems are: 1) potential ''cybersickness'', a form of motion sickness which is experienced in virtual worlds, and 2) maladaptive sensorimotor performance following exposure to VR systems. Interestingly, these aftereffects are often quite similar to adaptive sensorimotor responses observed in astronauts during and/or following space flight. Most astronauts and cosmonauts experience perceptual and sensorimotor disturbances during and followin...
Keywords: IMAGING TECHNIQUES; UPLINKING; TARGETS; INSPECTION; ROVING VEHICLES; MARS SURFACE; ROBOTICS; AUTONOMY; COST REDUCTION; HAZARDS; PRODUCTIVITY
|Workshop on evolution of igneous asteroids: Focus on Vesta and the HED meteorites - NON|
Recently, the geology of the surface of Vesta has been coming to light. In 1983 Gaffey first began showing maps of the surface geology of Vesta constructed from numerous spectra obtained at different times as the asteroid rotated. By noting the details of spectral variation with rotation, he was able to develop two possible gross-scale geologic maps of Vesta showing the distributions of mafic and ultramafic materials...
Keywords: MINIATURIZATION; PAYLOADS; VOLUME; WEIGHT (MASS); FIBER OPTICS; FABRICATION; SPECTROMETERS; CHEMICAL ANALYSIS; CALIBRATING; COST REDUCTION; IODINE; MODEMS
|Ozone in the Pacific Troposphere from Ozonesonde Observations - Oltmans, S. J.|
Ozone vertical profile measurements obtained from ozonesondes flown at Fiji, Samoa, Tahiti and the Galapagos are used to characterize ozone in the troposphere over the tropical Pacific. There is a significant seasonal variation at each of these sites. At sites in both the eastern and western Pacific, ozone is highest at almost all levels in the troposphere during the September-November season and lowest during, March-May...
Keywords: GOALS; MANUFACTURING; RELIABILITY; REQUIREMENTS; SPECIFICATIONS; AEROSPACE SYSTEMS; AEROSPACE VEHICLES; SAFETY; COST REDUCTION; LOW COST; MAINTENANCE
|Computer graphics for management: An abstract of capabilities and applications of the EIS system - Solem, B. J|
The Executive Information Services (EIS) system, developed as a computer-based, time-sharing tool for making and implementing management decisions, and including computer graphics capabilities, was described. The following resources are available through the EIS languages: centralized corporate/gov't data base, customized and working data bases, report writing, general computational capability, specialized routines, modeling/programming capability, and graphics...
Keywords: AIRCRAFT DESIGN; COMPUTER GRAPHICS; INTERACTIONS; MAN MACHINE SYSTEMS; MANUFACTURING; ACCURACY; BODIES; COMPUTER TECHNIQUES; COST REDUCTION
|Experimental Supersonic Combustion Research at NASA Langley - Rogers, R. Clayton|
Experimental supersonic combustion research related to hypersonic airbreathing propulsion has been actively underway at NASA Langley Research Center (LaRC) since the mid-1960's. This research involved experimental investigations of fuel injection, mixing, and combustion in supersonic flows and numerous tests of scramjet engine flowpaths in LaRC test facilities simulating flight from Mach 4 to 8. Out of this research effort has come scramjet combustor design methodologies, ground test techniques,...
Keywords: ACTIVE CONTROL; ELECTRONIC CONTROL; COMBUSTION CHAMBERS; TURBINES; STATORS; VANES; FUEL FLOW; FEEDBACK CONTROL; COST REDUCTION
|Mirror fusion propulsion system: A performance comparison with alternate propulsion systems for the manned Mars Mission - Schulze, Norman R.|
The performance characteristics of several propulsion technologies applied to piloted Mars missions are compared. The characteristics that are compared are Initial Mass in Low Earth Orbit (IMLEO), mission flexibility, and flight times. The propulsion systems being compared are both demonstrated and envisioned: Chemical (or Cryogenic), Nuclear Thermal Rocket (NTR) solid core, NTR gas core, Nuclear Electric Propulsion (NEP), and a mirror fusion space propulsion system...
Keywords: AMORPHOUS SILICON; ENERGY CONVERSION EFFICIENCY; SOLAR CELLS; SPACECRAFT POWER SUPPLIES; COST REDUCTION; MARS BASES; MODULES; POLYIMIDES
|Accurate solutions, parameter studies and comparisons for the Euler and potential flow equations - Anderson, W. Kyle|
Parameter studies are conducted using the Euler and potential flow equation models for unsteady and steady flows in both two and three dimensions. The Euler code is an implicit, upwind, finite volume code which uses the Van Leer method of flux-vector-splitting which has been recently extended for use on dynamic meshes and maintain all the properties of the original splitting. The potential flow code is an implicit, finite difference method for solving the transonic small disturbance equations an...
Keywords: COMPUTER PROGRAMMING; FORTRAN; RULES; CODING; COST REDUCTION; INPUT/OUTPUT ROUTINES; INSTRUCTION SETS (COMPUTERS)
|Pulse Shaped 8-PSK Bandwidth Efficiency and Spectral Spike Elimination - Tao, Jian-Pin|
The most bandwidth-efficient communication methods are imperative to cope with the congested frequency bands. Pulse shaping methods have excellent effects on narrowing bandwidth and increasing band utilization. The position of the baseband filters for the pulse shaping is crucial. Post-modulation pulse shaping (a low pass filter is located after the modulator) can change signals from constant envelope to non-constant envelope, and non-constant envelope signals through non-linear device (a SSPA o...
Keywords: CLEMENTINE SPACECRAFT; RISK; SCHEDULES; COSTS; COMPUTER PROGRAMS; SOFTWARE ENGINEERING; COST REDUCTION; PRIORITIES; NASA SPACE PROGRAMS
|The Fringe-Imaging Skin Friction Technique PC Application User's Manual - Zilliac, Gregory G|
A personal computer application (CXWIN4G) has been written which greatly simplifies the task of extracting skin friction measurements from interferograms of oil flows on the surface of wind tunnel models. Images are first calibrated, using a novel approach to one-camera photogrammetry, to obtain accurate spatial information on surfaces with curvature. As part of the image calibration process, an auxiliary file containing the wind tunnel model geometry is used in conjunction with a two-dimensiona...
Keywords: AUTOMATIC CONTROL; HARDWARE; DESIGN ANALYSIS; ALGORITHMS; SEARCH PROFILES; CIRCUIT DIAGRAMS; INTEGRATED CIRCUITS; COST REDUCTION; PRODUCT DEVELOPMENT
|Commercial Systems Validation Overview - Ryan, Rober|
The Commercial Systems Validation Laboratory (CSVL) is composed of the 1) Virtual Product Laboratory (VPL), 2) Commercial Instrument Validation Laboratory (CIVL), and 3) In-Flight Verification & Validation Network (IVVN). All three laboratories are described in this viewgraph presentation, which covers the characterization of CCD cameras, hyperspectral sensors, ground reference equipment, and the Multispectral Thermal Imager (MTI)...
Keywords: DATA ACQUISITION; DATA PROCESSING; SYSTEMS ENGINEERING; COST REDUCTION; DISTRIBUTED PROCESSING; ROCKET TEST FACILITIES
|Government financial support for civil aircraft research, technology and development in four European countries and the United States - Chandler, B.|
Data on the levels of government financial support for civil aircraft airframe and engine (CAAE) research and technology (R&T) in the United States and Europe (United Kingdom, West Germany, France and The Netherlands) and means of comparing these levels are provided. Data are presented for the years 1974-1977. European R&T expenditure data were obtained through visits to each of the four European countries, to the Washington office of the European Communities, and by a search of applicable liter...
Keywords: CZOCHRALSKI METHOD; INGOTS; PHOTOVOLTAIC CONVERSION; SILICON; SOLAR CELLS; COST REDUCTION; ENERGY TECHNOLOGY; PROCESS CONTROL (INDUSTRY)
|Three state-of-the-art individual electric and hybrid vehicle test reports, volume 2 - NON|
Procedures used in determining the energy efficiency and economy of a gasoline-electric hybrid taxi, an electric passenger car, and an electric van are described. Tabular and graphic data show results of driving cycle and constant speed tests, energy distribution to various components, efficiency of the components, and, for the hybrid vehicle, the emissions.
Keywords: AIRCRAFT ENGINES; ENERGY CONSERVATION; ENGINE DESIGN; TURBINE ENGINES; AIRCRAFT NOISE; COST REDUCTION; ENVIRONMENT PROTECTION; EXHAUST GASES
|Long-term corrosion evaluation of stainless steels in Space Shuttle iodinated resin and water - Krohn, Douglas D|
The effects of stainless steel exposure to iodinated water is a concern in developing the Integrated Water System (IWS) for Space Station Freedom. The IWS has a life requirement of 30 years, but the effects of general and localized corrosion over such a long period have not been determined for the candidate materials. In 1978, Umpqua Research Center immersed stainless steel 316L, 321, and 347 specimens in a solution of deionized water and the Space Shuttle microbial check valve resin...
Keywords: AEROSPACE SYSTEMS; COST ANALYSIS; COST REDUCTION; MANUFACTURING; PRODUCTION COSTS; DOWNTIME; PRODUCTIVITY; PROJECT PLANNING; SCRAP
|A Deterministic Interfacial Cyclic Oxidation Spalling Model - Smialek, James L|
An equation has been developed to model the iterative scale growth and spalling process that occurs during cyclic oxidation of high temperature materials. Parabolic scale growth and spalling of a constant surface area fraction have been assumed. Interfacial spallation of the only the thickest segments was also postulated. This simplicity allowed for representation by a simple deterministic summation series...
Keywords: AGRICULTURAL AIRCRAFT; OPERATING COSTS; AGRICULTURE; COMMERCE; ECONOMIC ANALYSIS; HERBICIDES; INSECTICIDES; FERTILIZERS; FARMLANDS; COST REDUCTION
|The development of a land use inventory for regional planning using satellite imagery - Hessling, A. H.|
Keywords: AIRCRAFT DESIGN; COMPUTER GRAPHICS; MANUFACTURING; SURFACE GEOMETRY; COST REDUCTION; DRAFTING MACHINES; FORTRAN; MILLING (MACHINING); SMOOTHING
|Design, Generation and Tooth Contact Analysis (TCA) of Asymmetric Face Gear Drive With Modified Geometry - Litvin, Faydor L.|
A new type of face gear drive for application in transmissions, particularly in helicopters, has been developed. The new geometry differs from the existing geometry by application of asymmetric profiles and double-crowned pinion of the face gear mesh. The paper describes the computerized design, simulation of meshing and contact, and stress analysis by finite element method. Special purpose computer codes have been developed to conduct the analysis...
Keywords: COST REDUCTION; GROUND STATIONS; SYSTEMS ANALYSIS; SUPPORT SYSTEMS; DATA MANAGEMENT; TELECOMMUNICATION
|On the Shoulders of Titans: A History of Project Gemini - Hacker, B. C|
Gemini was the intermediate manned space flight program between America's first steps into space with Mercury and the manned lunar expeditions of Apollo. Because of its position between these two other efforts, Gemini is probably less remembered. Still, it more than had its place in man's progress into this new frontier. Gemini accomplishments were manyfold. They included many firsts: first astronaut-controlled maneuvering in space; first rendezvous in space of one spacecraft with another; first...
Keywords: ENERGY CONSERVATION; SOLAR HOUSES; TECHNOLOGY UTILIZATION; COST REDUCTION; SECURITY; WATER RECLAMATION
|A Collection of Technical Papers - NON|
Papers presented at the 6th Space Logistics Symposium covered such areas as: The International Space Station; The Hubble Space Telescope; Launch site computer simulation; Integrated logistics support; The Baikonur Cosmodrome; Probabalistic tools for high confidence repair; A simple space station rescue vehicle; Integrated Traffic Model for the International Space Station; Packaging the maintenance shop; Leading edge software support; Storage information management system; Consolidated maintenanc...
Keywords: CONNECTION MACHINE; SORTING ALGORITHMS; HYPERCUBE MULTIPROCESSORS; PARALLEL COMPUTERS; COST REDUCTION; REVISIONS
|Analysis of Flow Angularity Repeatability Tests in the NTF - Hemsch, Michael J|
An extensive data base of flow angularity repeatability measurements from four NTF check standard model tests is analyzed for statistical consistency and to characterize the results for prediction of angle-of-attack uncertainty for customer tests. A procedure for quality assurance for flow angularity measurements during customer tests is also presented. The efficacy of the procedure is tested using results from a customer test.
Keywords: CALIBRATING; VIRTUAL REALITY; DISPLAY DEVICES; COMMODITIES; RESEARCH FACILITIES; COST REDUCTION; LOW COST; PROJECTORS
|Status of Flexible CIS Research at ISET - Basol, B. M.|
Great advances have been made in polycrystalline thin film terrestrial solar cell technologies since early 1980's when the first promising laboratory devices with high efficiencies were demonstrated. These cells were fabricated on polycrystalline CdTe and CuInSe2 (CIS) layers and they had AM1.5 conversion efficiencies of around 10. During the last decade, the polycrystalline thin film solar cell efficiencies have improved to over 15 range and the stability data obtained from these devices has be...
Keywords: RESEARCH AND DEVELOPMENT; MISSION PLANNING; PAYLOADS; LAUNCHING; TECHNOLOGIES; LAUNCH VEHICLES; COST REDUCTION
|An investigation of induced-pressure phenomena on axially symmetric, flow-alined, cylindrical models equipped with different nose shapes at free-stream Mach numbers from 15.6 to 21 in helium - Mueller, James N.|
No Abstract Available
Keywords: COST REDUCTION; ELECTRIC CURRENT; ELECTRIC POWER SUPPLIES; ENERGY CONSUMPTION; COST ESTIMATES; RESOURCES MANAGEMENT; SYSTEMS ENGINEERING
|Effective Thermal Conductivity of High Porosity Open Cell Nickel Foam - Sullins, Alan D.|
The effective thermal conductivity of high-porosity open cell nickel foam samples was measured over a wide range of temperatures and pressures using a standard steady-state technique. The samples, measuring 23.8 mm, 18.7 mm, and 13.6 mm in thickness, were constructed with layers of 1.7 mm thick foam with a porosity of 0.968. Tests were conducted with the specimens subjected to temperature differences of 100 to 1000 K across the thickness and at environmental pressures of 10(exp -4) to 750 mm Hg...
Keywords: BOUNDARY CONDITIONS; COMPUTATION; POROSITY; SIMULATION; MATHEMATICAL MODELS; AERODYNAMICS; AGGREGATES; LEADING EDGES; FOREBODIES; COST REDUCTION
|Two Formal Gas Models For Multi-Agent Sweeping and Obstacle Avoidance - Kerr, Wesley|
The task addressed here is a dynamic search through a bounded region, while avoiding multiple large obstacles, such as buildings. In the case of limited sensors and communication, maintaining spatial coverage - especially after passing the obstacles - is a challenging problem. Here, we investigate two physics-based approaches to solving this task with multiple simulated mobile robots, one based on artificial forces and the other based on the kinetic theory of gases...
Keywords: COST REDUCTION; ROBOTICS; SOLAR SYSTEM; PAYLOADS; THERMAL PROTECTION; TEMPLATES; CERTIFICATION; MISSION PLANNING; NASA PROGRAMS; QUALIFICATIONS; RISK
|Deconditioning and Reconditioning: Humans in Stressful Environments - NON|
Deconditioning is an integrated physiological response of the body to a reduction in metabolic rate; that is, to a reduction in energy use or in exercise level. While it may involve assumption of a horizontal body position, it certainly perturbs bodily homeostasis - at least temporarily. The reduction in physical activity that causes deconditioning is often associated with an increase in the time spent, for whatever reason, in a sitting or horizontal position...
Keywords: SPACE MISSIONS; OPERATIONS; PROCEDURES; ASSESSMENTS; COST REDUCTION; ORGANIZATIONS; RISK; SHAPES; TELECONFERENCING
|Crack Driving Forces in a Multilayered Coating System for Ceramic Matrix Composite Substrates - Ghosn, Louis J.|
The effects of the top coating thickness, modulus and shrinkage strains on the crack driving forces for a baseline multilayer Yttria-Stabilized-Zirconia/Mullite/Si thermal and environment barrier coating (TEBC) system for SiC/SiC ceramic matrix composite substrates are determined for gas turbine applications. The crack driving forces increase with increasing modulus, and a low modulus thermal barrier coating material (below 10 GPa) will have no cracking issues under the thermal gradient conditio...
Keywords: PREDICTION ANALYSIS TECHNIQUES; SATELLITE CONSTELLATIONS; MISSION PLANNING; AUTONOMOUS NAVIGATION; FORMATION FLYING; COST REDUCTION; TELEMETRY
|Formal Methods for Life-Critical Software - Butler, Ricky W.|
The use of computer software in life-critical applications, such as for civil air transports, demands the use of rigorous formal mathematical verification procedures. This paper demonstrates how to apply formal methods to the development and verification of software by leading the reader step-by-step through requirements analysis, design, implementation, and verification of an electronic phone book application...
Keywords: DESIGN TO COST; COST ANALYSIS; COMPLEXITY; DESIGN OPTIMIZATION; AEROSPACE INDUSTRY; COST ESTIMATES; COST REDUCTION
|A Unique Power System For The ISS Fluids And Combustion Facility - Fox, David A.|
Unique power control technology has been incorporated into an electrical power control unit (EPCU) for the Fluids and Combustion Facility (FCF). The objective is to maximize science throughput by providing a flexible power system that is easily reconfigured by the science payload. Electrical power is at a premium on the International Space Station (ISS). The EPCU utilizes advanced power management techniques to maximize the power available to the FCF experiments...
Keywords: SPACECRAFT LAUNCHING; SPACECRAFT PROPULSION; SPACE FLIGHT; NASA SPACE PROGRAMS; COST REDUCTION; RELIABILITY; RISK; SAFETY
|A Study of Possible Solar Sail Applications for Mars Missions - Percy, Thomas K.|
A study was performed in conjunction with the In Space Technology Investment Area of NASA's Marshall Space Flight Center to investigate potential applications of solar sails to Mars missions. While solar sails have been proposed as possible candidates for several missions, including Geostorm and a Polar Observer mission, Mars has often been overlooked as a potential destination. It was found that solar sails may have potential in Mars observation missions with smaller payloads...
Keywords: GRID GENERATION (MATHEMATICS); EXPERT SYSTEMS; COMPUTATIONAL FLUID DYNAMICS; PROCEDURES; DATA BASES; COST REDUCTION
|Endpoint Security Using Biometric Authentication for Secure Remote Mission Operations - Donohue, John T.|
We propose a flexible security authentication solution for the spacecraft end-user, which will allow the user to interact over Internet with the spacecraft, its instruments, or with the ground segment from anywhere, anytime based on the user's pre-defined set of privileges. This package includes biometrics authentication products, such as face, voice or fingerprint recognition, authentication services and procedures, such as: user registration and verification over the Internet and user database...
Keywords: PROTOTYPES; ARCHITECTURE (COMPUTERS); SIMULATORS; SIMULATION; INTERFACES; TECHNOLOGY ASSESSMENT; COST REDUCTION; RISK
|Characterization of Individual Aerosol Particles Associated with Clouds (CRYSTAL-FACE) - Buseck, Peter R|
The aim of our research was to obtain data on the chemical and physical properties of individual aerosol particles from near the bottoms and tops of the deep convective systems that lead to the generation of tropical cirrus clouds and to provide insights into the particles that serve as CCN or IN. We used analytical transmission electron microscopy (ATEM), including energy-dispersive X-ray spectrometry (EDS) and electron energy-loss spectroscopy (EELS), and field-emission electron microscopy (FE...
Keywords: AIRLINE OPERATIONS; AVIONICS; STANDARDIZATION; ECONOMICS; MANAGEMENT PLANNING; COST REDUCTION; POWER PLANTS; AIRCRAFT MODELS
|Diffuse Galactic Continuum Gamma Rays. A Model Compatible with EGRET Data and Cosmic-ray Measurements - Strong, Andrew W.|
We present a study of the compatibility of some current models of the diffuse Galactic continuum gamma-rays with EGRET data. A set of regions sampling the whole sky is chosen to provide a comprehensive range of tests. The range of EGRET data used is extended to 100 GeV. The models are computed with our GALPROP cosmic-ray propagation and gamma-ray production code. We confirm that the ''conventional model'' based on the locally observed electron and nucleon spectra is inadequate, for all sky regio...
Keywords: FAILURE; ERRORS; COMPUTER SYSTEMS PROGRAMS; COMPUTER PROGRAMS; SOFTWARE ENGINEERING; RISK; DEPLOYMENT; COST REDUCTION; JAVA (PROGRAMMING LANGUAGE)
|Collision Integrals for a Modified Stockmayer Potential - Itean, Engene C.|
Collision integrals were calculated for the modified Stockmayer potential E(r) = 4 epsilon [(sigma/r)(exp 12) - (sigma/r)(exp 6) - delta(sigma/r)(exp 3)], which may be applied to polar molecules. It was assumed that the colliding molecules maintain their same relative orientation during the encounter. Calculations of the integrals were made for a large reduced temperature range and for a range of delta from 0 to 10...
Keywords: THERMAL ANALYSIS; FIRES; COST REDUCTION; BURNS (INJURIES); DESIGN ANALYSIS; GAS GENERATORS; EVALUATION; THERMOCOUPLES; SYMBOLS; SPENT FUELS; OXYGEN; GAS TURBINES
|Phase space flow of particles in squeezed states - Ceperley, Peter H|
The manipulation of noise and uncertainty in squeezed states is governed by the wave nature of the quantum mechanical particles in these states. This paper uses a deterministic model of quantum mechanics in which real guiding waves control the flow of localized particles. This model will be used to examine the phase space flow of particles in typical squeezed states.
Keywords: COST REDUCTION; INTERNATIONAL COOPERATION; SPACE LABORATORIES; INVENTORIES; MANAGEMENT PLANNING; RESEARCH AND DEVELOPMENT; RESEARCH FACILITIES; AEROSPACE INDUSTRY; CONSOLIDATION; ECONOMIC FACTORS; FORECASTING